301DIV OPERATING
INSTRUCTIONS
1.
Connect detector(s) in
accordance with detector
connection instructions.
2.
Select detector polarity:
Common anode for UDT, LSC
and SC series, or common
cathode for SPOT series.
3.
Select detector bias. Caution:
15V bias and wrong polarity
can damage detectors.
4.
Connect 301DIV to AC line,
and connect monitor
instruments such as digital
voltmeters, oscilloscopes or
recorders, to sum and position
outputs.
5.
Illuminate the detector.
6.
Turn instrument power on.
7.
Check that the sum output is
positive. If it is not, check
detector wiring, and verify
detector polarity.
8.
Set range switch for proper
sensitivity. Select highest
position possible, without
lighting HI light level LED.
9.
It is recommended that
Schottky barrier detectors be
biased, for maximum lifetime
and performance. Schottky
detectors can be identified by
absence of a “D” suffix in their
model number. Lateral-effect
devices tend to saturate at
moderate light levels. This
may be observed by scanning
a light spot across the
detector along one axis. If the
sum output (sum of X and Y-
axes for dual-axis operation)
shows a broad dip near the
center
of the detector, biasing is
required. Biasing may also
be desirable when using the
301DIV-30kHz. Since the
bias reduces the detector
junction capacitance, higher
speed response is possible
from the detector.
10.
If it is necessary to adjust the
zero or range of the 301DIV
output to accommodate the
readout device, adjust the
CAL and ZERO
potentiometers with a small-
blade screwdriver. To return
full output to 10V, turn the
CAL potentiometer fully
clockwise. To return the
ZERO potentiometer to
electrical zero, select two 100
K ohm to 1 Meg ohm resistors
matched within 0.15%, and
connect one resistor between
each amplifier input pin (E
and D) and common (H).
Then adjust the zero
potentiometer for OV at the
position output connector.
DETECTOR CONNECTION
INSTRUCTIONS
If UDT detector/cable assemblies
are employed, connect the cable
output connector to the 301DIV
input.
If component level
detectors are to be used, carefully
connect as follows:
PIN-LSC/5D, PIN-LSC/30D.
Connect detector outputs (end
points) to amplifier inputs E and D,
and detector common (center pin)
to amplifier input H.
(See Fig. 1)
PIN-LSC/4, PIN-LSC/9.
Connect detector pins labeled (-)
to amplifier inputs E and D, and
detector common (+) to input H.
Only one (+) pin need be
connected. As usual, bias is
recommended when using
Schottky barrier devices.
(See Fig. 1)
PIN-SC/4D, PIN-SC/10D,
PIN-SC/25D
Two amplifiers are required for
dual-axis operation. Connect X-
pins to inputs E and D, and Y-pins
to inputs A and B on amplifier #1.
On amplifier #2, jumper inputs A
and B to inputs E and D. (Y-axis
pins may be directly connected to
amplifier #2 (if preferred). Also
connect detector common to input
H on amplifier #1 and interconnect
input F on both amplifiers.
(See Figs. 1 & 2)
PIN-SC/50
Same connections as for PIN-
SC/4D. As usual, bias is
recommended when using
Schottky barrier devices.
(See Figs. 1 & 2)
PIN-SPOT/2D
Connect detector outer pins to
inputs E and D, and detector
common to input H.
(See Fig. 1)
PIN-SPOT/4D, PIN-SPOT/9D
Two amplifiers required. Connect
same as PIN-SC/4D, except
connect detector common to input
F on amplifier #1.
(See Figs. 1 & 3)
For best results, insure that the
amplifier inputs are fully shielded.
Use input F for shield ground.
UDT Instruments • 8581 Aero Drive • San Diego, CA 92123
Phone (858) 279-8035 Fax (858) 576-9286
